JSFiddle - React, Tailwind, and code Playground
JavaScript
var regex = /.*(\/|\\)/;
var path1 = 'C:\fakepath\filename.doc'.replace(regex, ''),
path2 = 'C:\\fakepath\\filename.doc'.replace(regex, ''),
path3 = '/var/fakepath/filename.doc'.replace(regex, '');
document.body.innerHTML = path1 + '<br>' + path2 + '<br>' + path3